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Setup environment to deploy configuration

The administrator of the build farm needs the following software to generate Jenkins jobs based on the build farm configuration:

  • Python 3
  • Python 3 package empy
  • Python 3 package jenkinsapi >= 0.2.26
  • Python 3 ROS package rosdistro >= 0.4.0
  • The Python package ros_buildfarm

Virtualenv

The easiest way is to use a Python virtual environment. This avoids collisions between the required Python 3 packages and already installed Python 2 packages used by ROS.

The following commands can be used on Ubuntu Trusty:

sudo apt update && sudo apt install python3 python3-all python3-pip

mkdir /tmp/deploy_ros_buildfarm
cd /tmp/deploy_ros_buildfarm

# the option '--without-pip' is used to work around a Python bug:
# https://bugs.launchpad.net/ubuntu/+source/python3.4/+bug/1290847
pyvenv-3.4 --without-pip venv

. venv/bin/activate

# necessary because of '--without-pip'
curl https://bootstrap.pypa.io/get-pip.py | python3

pip3 install empy
pip3 install jenkinsapi
pip3 install rosdistro
pip3 install ros_buildfarm

Provide credentials for Jenkins master

To allow ros_buildfarm to configure any jobs on the Jenkins master it requires credentials. Create the .ini file ~/.buildfarm/jenkins.ini containing your credentials to log in to the Jenkins master, e.g.:

[http://jenkins-instance-url.example.com:8080]
username=admin
password=changeme

You can put multiple separate sections for different hosts into the configuration file as well as use a section [DEFAULT] which is being used if no host specific section is found.

Instead of putting the plain password in this configuration you can use the API token of your Jenkins user. To get the API token (or change it) go to the configure page of your Jenkins user (http://YOUR-JENKINS/me/configure).

If you are using your GitHub account to log in to Jenkins you can use a token instead of your plain text password (see the GitHub help on how to create a token).

Using a different version of ros_buildfarm

Instead of installing ros_buildfarm via PIP you can also use the Python package from a git checkout:

cd /tmp/deploy_ros_buildfarm
git clone https://github.com/ros-infrastructure/ros_buildfarm.git
cd ros_buildfarm
export PYTHONPATH=`pwd`:$PYTHONPATH

Note when using ros_buildfarm from a checked out branch it implies that all Jenkins jobs generated from that checkout will use the same branch. Therefore they will change behavior whenever changes are committed to that branch. Usually you want to use a checkout of a specific tag to prevent this from happening.

Using a branch might be desired during development or to roll out small changes immediately. But be aware that some changes in ros_buildfarm require configured Jenkins jobs and the scripts in the ros_buildfarm repository to be in sync and therefore to redeploy the Jenkins jobs.

Using forked version of ros_buildfarm

You can use the above behavior to easily fork ros_buildfarm, apply arbitrary customizations to the source code and the then run the job generation from a checkout of that repository.